When taking the simplified home office deduction can you also claim cell phone Internet or additional phone lines or does the continued

Yes, you can claim those as normal business expenses on Schedule C.  These items are not part of the Home Office deduction.

To get back to that area: While inside the software and working on your return, type Schedule C in the Search at the top of the screen (you may see a magnifying glass there).  There will be a popup that says Jump to Schedule C.  Select that to get to the general area. 

Then:

• select Edit next to your business (if it is there)
• scroll to Business Expenses
• then Select Other Common Business